<template>
  <div v-loading="audio.waiting" class="di main-wrap">
    <!-- 这里设置了ref属性后，在vue组件中，就可以用this.$refs.audio来访问该dom元素 -->
    <audio
      ref="audio"
      :src="url"
      :preload="audio.preload"
      class="dn"
      @play="onPlay"
      @error="onError"
      @waiting="onWaiting"
      @pause="onPause"
      @timeupdate="onTimeupdate"
      @loadedmetadata="onLoadedmetadata"
    />

    <div class="audioOut">
      <el-card class="mainAudio myCard">
          <el-row key="1" type="flex" justify="center" class="row-bg">
          <el-col :span="2">
            <el-button
              :icon="audio.playing ?'iconfont icon-zanting':'iconfont icon-ziyuan74'"
              type="primary"
              size="medium"
              class="playButton"
              @click="startPlayOrPause"
            />
          </el-col>
          <el-col :span="2" v-show="controlList.noPadding">
            <span type="info" class="timeInfo" >&#32;&#32;&#32;&#32;&#32;</span>
          </el-col>
          <el-col :span="6" class="hidden-md-and-down" v-show="!controlList.noDownload">
            <span type="info" class="timeInfo" >{{ audio.currentTime | formatSecond }}/{{ audio.maxTime | formatSecond }}</span>
          </el-col>
          <el-col :span="13" class="hidden-sm-and-down" v-show="!controlList.noProcess">
            <el-slider  v-model="sliderTime" :format-tooltip="formatProcessToolTip" class="slider" @change="changeCurrentTime" />
          </el-col>
          <el-col :span="2" :class="['mutedKey'+index, 'hidden-sm-and-down']"  v-show="!controlList.noMuted">
            <!-- 音量按钮 -->
            <!-- <div :id="'myMute'+index" class="volmeBand">
              <el-slider
                v-model="volume"
                :format-tooltip="formatVolumeToolTip"
                @change="changeVolume"
                >
              </el-slider>
            </div> -->
            <el-button
              :class="[audio.muted ? 'gray' : 'light']"
              type="primary"
              icon="iconfont icon-ziyuan73"
              size="medium"
              @click="startMutedOrNot"
            />
          </el-col>
          <el-col :span="2" class="hidden-md-and-down"  v-show="!controlList.noDownload">
            <el-button
              :href="url"
              download="audio.wav"
              icon="el-icon-bottom"
              type="primary"
              class="download"
              target="_blank"
              @click="downAudio(url)"
            />
          </el-col>
          <!-- <el-button v-show="!controlList.noMuted" type="text" @click="startMutedOrNot">{{audio.muted | transMutedOrNot}}</el-button> -->
          <!-- <el-slider
            v-show="!controlList.noVolume"
            v-model="volume"
            :format-tooltip="formatVolumeToolTip"
            @change="changeVolume"
            class="slider"
            vertical
            height="50px"
            >
          </el-slider> -->
          <!-- <a :href="url" v-show="!controlList.noDownload" target="_blank" class="download" download>下载</a> -->
        </el-row>
      </el-card>
    </div>
  </div>
</template>

<script>
import 'element-ui/lib/theme-chalk/display.css'
import * as d3 from 'd3'
function realFormatSecond(second) {
  var secondType = typeof second

  if (secondType === 'number' || secondType === 'string') {
    second = parseInt(second)
    var mimute = Math.floor(second / 60)
    second = second - mimute * 60
    return ('0' + mimute).slice(-2) + ':' + ('0' + second).slice(-2)
  } else {
    return '0:00:00'
  }
}

export default {
  filters: {
    formatSecond(second = 0) {
      return realFormatSecond(second)
    },
    transPlayPause(value) { // 暂时不适用过滤器
      return value ? '暂停' : '播放'
    },
    transMutedOrNot(value) {
      return value ? '放音' : '静音'
    },
    transSpeed(value) {
      return '快进: x' + value
    }
  },
  props: {
    theUrl: {
      type: String,
      required: true
    },
    theSpeeds: {
      type: Array,
      default() {
        return [1, 1.5, 2]
      }
    },
    theControlList: {
      type: String,
      default: ''
    },
    index: Number
  },
  data() {
    return {
      url: this.theUrl || 'http://devtest.qiniudn.com/secret base~.mp3',
      audio: {
        currentTime: 0,
        maxTime: 0,
        playing: false,
        muted: false,
        speed: 1,
        waiting: true,
        preload: 'auto'
      },
      mutedShow: false,
      sliderTime: 0,
      volume: 100,
      speeds: this.theSpeeds,

      controlList: {
        // 不显示下载
        noDownload: false,
        // 不显示静音
        noMuted: false,
        // 不显示音量条
        noVolume: false,
        // 不显示进度条
        noProcess: false,
        // 只能播放一个
        onlyOnePlaying: false,
        // 不要快进按钮
        noSpeed: false,
        noPadding: false,
      }
    }
  },
  watch: {
    theUrl: function() {
      this.url = this.theUrl
      this.audio.playing = false
    }
  },
  created() {
    this.setControlList()
  },
  mounted() {
    this.changeMutedKey()
  },
  methods: {
    downAudio(param) {
      const filename = 'audio.wav'
      fetch(param, {
        headers: new Headers({
          Origin: location.origin
        }),
        mode: 'cors'
      })
        .then(res => res.blob())
        .then(blob => {
          const blobUrl = window.URL.createObjectURL(blob)
          this.download(blobUrl, filename)
          window.URL.revokeObjectURL(blobUrl)
        })
    },
    download(href, filename) {
      const a = document.createElement('a')
      a.download = filename
      a.href = href
      document.body.appendChild(a)
      a.click()
      a.remove()
    },
    setControlList() {
      const controlList = this.theControlList.split(' ')
      controlList.forEach((item) => {
        if (this.controlList[item] !== undefined) {
          this.controlList[item] = true
        }
      })
    },
    changeSpeed() {
      const index = this.speeds.indexOf(this.audio.speed) + 1
      this.audio.speed = this.speeds[index % this.speeds.length]
      this.$refs.audio.playbackRate = this.audio.speed
    },
    startMutedOrNot() {
      this.$refs.audio.muted = !this.$refs.audio.muted
      this.audio.muted = this.$refs.audio.muted
    },
    // 音量条toolTip
    formatVolumeToolTip(index) {
      return '音量条: ' + index
    },
    // 进度条toolTip
    formatProcessToolTip(index = 0) {
      index = parseInt(this.audio.maxTime / 100 * index)
      return '进度条: ' + realFormatSecond(index)
    },
    // 音量改变
    changeVolume(index = 0) {
      this.$refs.audio.volume = index / 100
      this.volume = index
    },
    // 播放跳转
    changeCurrentTime(index) {
      this.$refs.audio.currentTime = parseInt(index / 100 * this.audio.maxTime)
    },
    startPlayOrPause() {
      return this.audio.playing ? this.pausePlay() : this.startPlay()
    },
    // 开始播放
    startPlay() {
      this.$refs.audio.play()
    },
    // 暂停
    pausePlay() {
      this.$refs.audio.pause()
    },
    // 当音频暂停
    onPause() {
      this.audio.playing = false
    },
    // 当发生错误, 就出现loading状态
    onError() {
      this.audio.waiting = true
    },
    // 当音频开始等待
    onWaiting(res) {
    },
    // 当音频开始播放
    onPlay(res) {
      this.audio.playing = true
      this.audio.loading = false
      if (!this.controlList.onlyOnePlaying) {
        return
      }
      const target = res.target
      const audios = document.getElementsByTagName('audio');

      [...audios].forEach((item) => {
        if (item !== target) {
          item.pause()
        }
      })
    },
    // 当timeupdate事件大概每秒一次，用来更新音频流的当前播放时间
    onTimeupdate(res) {
      this.audio.currentTime = res.target.currentTime
      this.sliderTime = parseInt(this.audio.currentTime / this.audio.maxTime * 100)
    },
    // 当加载语音流元数据完成后，会触发该事件的回调函数
    // 语音元数据主要是语音的长度之类的数据
    onLoadedmetadata(res) {
      this.audio.waiting = false
      this.audio.maxTime = parseInt(res.target.duration)
    },
    changeMutedKey() {
      d3.selectAll('.volmeBand')
        .style('display', 'none')
      var select = d3.selectAll('.volmeBand')
      // var vm = this
      select
        .on('mouseover', function() {
          d3.selectAll('.volmeBand')
            .style('display', 'null')
        })
        .on('mouseout', function() {
          // d3.select('#myMute' + vm.index).node()
          //   .style('display', 'none')
        })
    }
  }
}
</script>

<style lang="less" scoped>
  .main-wrap{
    // padding: 10px 15px;
  }
  .slider {
    // display: inline-block;
    // width: 100px;
    // position: relative;
    // top: 14px;
    // margin-left: 15px;
    padding-left: 3px;
  }

  .di {
    display: block;
  }

  .download {
    color: #409EFF;
    //float: left;
    text-align: center;
  }

  .dn{
    display: none;
  }
  /deep/.el-button{
    padding: 0;
  }
  .el-button--primary {
  // background-color: #736FBC;
    background-color: white;
    color: #8F8AD7;
    border: #8F8AD7;
    font-size: 20px;
  }
  .row-bg {
    align-items: center;
  }
  .mainAudio {
    width: 100%;
  }
  .light{
    color: #8F8AD7;
  }
  .gray{
    color:gray;
  }
  .download{
    color:#8F8AD7;
  }
  /deep/.hidden-md-and-down{
    text-align: center;
  }
  /deep/.playButton{
    float:right;
  }
  /deep/.myCard {
    .timeInfo{
      font-size: 9px;
    }
    .el-slider__button{
      border-color: #625EB3
    }
    .el-slider__bar{
      background-color: #625EB3;
    }
    .el-card__body{
      padding: 0;
    }
    margin-right: 1%;
    border-radius: 30px;
  }
  .audioOut{
    height: 30%;
  }
</style>
